I didn't realize it because the meson build was returning 'windows' for
GIMP_BUILD_PLATFORM when I cross-built with Mingw-w64. But in the
autotools, it was storing "mingw32", which would not compare with our
gimp_versions.json. Therefore in GIMP 2.10.16, the version update check
would have worked, but not the revision check.
This fixes the problem.
I realized having the revision as a build number is the wrong idea as it
implies packagers will have to rebuild GIMP for just a revision. Yet
very often revision may just be data change or dependency fix/update
without rebuild needed (i.e. no ABI change).
Instead let's keep this package information as a file 'gimp-release'
(inspired by /etc/os-release and other /etc/*-release files of
distributions).
The idea is to be able to advertize a new revision of the same version
of GIMP. For instance, this would apply when we release a
`gimp-2-10-14-setup-3.exe` Windows installer (then we are at revision
3, provided we started at revision 0).
The revision number is obviously only relevant to a given platform and
version. Also the concept of build ID allows to differentiate various
builds for a same platform, in particular to not look at revisions of
third-party builds. The build ID can be any string. Maybe we could just
use reverse DNS build id (such as "org.gimp.GIMP_official") to identify
the official GIMP build. So in the end, we only compare revisions for an
identical (version, platform, build-id) tuple.
The point will be for a packager to create a unique build ID to identify
the build or provenance. I also add a revision number so that we can
identify 2 builds from the same version/commit, same maker and platform.
It will also be used later to check for new versions (see "phone home"
feature #2584).
Separating autotools and meson commits for easy backport.
Since commit 9fdf35550b, I removed the GIMP_APP_GLUE_COMPILATION check
because we need to have the whole versioning info from the new debug
widget. It just makes sense to go further and just make this a proper
internal API to get version information.
Jehan